Change of speed



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CHANGE OF SPEED.

No. 414,324. Patented Nov. 5, 1889.

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UNITED STATES PATENT OFFICE.

CHARLES E. PATRIC, OF SPRINGFIELD, OHIO.

CHANGE OF SPEED.

SPECIFICATION forming part of Letters Patent No. 414,324, dated November5, 1889.

Application filed July 15, 1889. Serial No. 317,542- (No model.)

To all whom it may concern:

Be it known that I, CHARLES E. PATRIC, a citizen of the United States,residing at Springfield,in the county of Clark and State of Ohio, haveinvented certain new and useful Improvement-s in Change of Speed, ofwhich the following is a specification.

7 My invention relates to an improvement in devices for readily changingthe speed of 'one moving part of a machine or mechanism with relation toanother connected directly thereto.

My invention is especially adapted for use in grain-drills to vary thequantity of seed sown by varying the speed of the feedingshaft, thoughthe device is by no means limited in its usefulness to this particularpurpose.

My invention consists in the various constructions and combinations ofparts, hereinafter described, and set forth in the claims.

In the accompanying drawings, Figure 1 is an elevation view illustratingmy device in connection with a portion of a grain-drill. Fig. 2 is anenlarged sectional view in detail of the driving wheel or pulley. Fig. 3is a side elevation view of the tension device. Figs. 4 and 5 arerespectively a plan and sectional elevation of a chain preferably usedfor forming the connection between the moving parts of my device. Fig. 6is a front elevation of the driving wheel or pulley, showing the radialslots in which the sprocket or driving projections are adapted to beadjusted. Fig. 7 is a front elevation view of the adjusting disk-wheelforming a portion of the driving wheel or pulley. Fig. Sis a rearelevation view of the same. Figs. 9, 10, and 11 are respectively a sideelevation, a plan, andasectional elevation of the sprocket projectionoperating in radial slots on the driving-pulley.

Like parts are represented by similar letters of reference throughoutthe several views.

In the said drawings, A represents the main frame of a grain-drill; B,the hopper; D, the driving-shaft, and E the feeding-shaft.

Located upon the driving-shaft D is myimproved adjustable driving pulleyor wheel F, provided with sprocket or driving projec tions at a,extending laterally from the face of said drivingpulley. l) is adriving-chain,

which passes about said sprocket projections and over a sprocket-wheel bon the feed-shaft E, and thence over suitable guiding-pulleys b b on atension device G, pivoted to the main frame. This tension device Gconsists, essentially, of an arm 0, provided at each end with suitablebearings for the guiding-wheels b b, and at the center with a trunnionc, turning in a suitable bearing 0 secured to the frame A. A spring 0about the trunnion c, and having its end secured, respectively, to theframe A and to the arm 0, is adapted to be compressed as the arm isturned in its bearing, the said spring thus furnishing means forpressing the guiding-Wheels Z7 5 against the respective sides of thechain 1).

The driving-sprockets a are each located in a slotted opening a in theface of the driving pulley or wheel F. These sprocket proj ections areeach formed with a T-shaped head a and an auxiliary projection of,adapted when turned in one position to be slipped through the slottedopening a, and when turned to the other position to come against theinner side of the driving pulley, and thus prevent the said projectionsfrom passing through said slotted openings.

Located immediately back of the main portion of the driving wheel orpulley F, and preferably journaled on the hub F of said pulley, is arevolving disk F provided on its face with a series of spiral slots (I,each extending from near the periphery of said disk to about the centerof said disk. The auX- iliary projection a on each of the sprocket ordriving projections to is adapted to fit into one of the spiral groovesd in the said disk, as shown in Fig. 2. A suitable handle d is providedfor turning said disk F with reference to the driving-pulley F, andsuitable means are provided for holding the said disk in any desiredposition with reference to the said pulley. It will be seen by thisconstruction that when the disk F is revolved with reference to thedrivingpulley F all the sprockets or driving projections a are movedsimultaneously to or from the center of said driving-pulley, therespective parts being in the device illustrated arranged so that.

about three-fourths of a revolution of the disk F moves the driving orsprocket pro jections from one end of the radial slots to the other. Thetension device G, operating automatically, takes up the slack of thedriving-chain as the driving-pulley is increased or diminished in sizeby thus moving its sprocket or driving projections. It will be seen,therefore, that by this construction any desired speed within certainlimits may be secured for the driven shaft with reference to the driver.

In order to provide for the proper paying out or compensation of thedriving-chain with reference to the sprocket projections whensaidsprocket projections are moved outwardly on the driving-pulley, Ipreferably form the said sprocket projections with a series ofratchetteeth 6, and provide on the driving-chain, preferably on theedges thereof, similar teeth e. In other respects the driving-chain maybe made of the usual sprocket form adapted to pass over an ordinarysprocket-wheel 1) upon the driven shaft. By the use of theseratchet-teeth e in connection with the similar teeth 6 on the chain andsprocket projections, respectively, the said chain is adapted to adjustitself to any movement of the sprocket projections and at the same timealways remains in driving contact with one or more of said sprocketprojections without any undue strain upon said chain, which wouldotherwise be the case if ordinary sprocket projections were used.

When my device is used in connection with grain-drills, I preferablyextend one or more of the spiral grooves 01 entirely through the disk Fand provide on the extended portion a of the sprocket projection in eachof said grooves a suitable marker or graduation adapted to come adjacentto similar graduations along the spirahgrooves, and thus designate theamount of adjustment of said sprocket projections, which adjustment,when the device is used in connection with seeding-machines, may be madein quantities or fractional portions of a bushel representing the amountof seed sown per acre by the speed of the feed-shaft when thedriving-pulley is adjusted to that particular point.

The means I have shown for holding the disk-wheel in the differentpositions of adj ustment consists of a small spring bolt or pin f,adapted to engage in a series of openings f, arranged about theperiphery of said diskwheel, the said openings being arranged andlocated in connection with the spiral slots, so that the adjustment ofthe disk wheel to a distance equal to one or more ofthe openings f willproduce an adjustment in the sprocket projections to cause a change inthe feed of the seed amounting to a certain fraction of a bushel peracre.

I have shown in the drawings only one adjustable wheel or pulley, whichis located on the driving-shaft. It will be seen, however, that, ifdesired, the adjustable pulley may be located either on the driving ordriven shaft,

or both of said'pulleys or wheels may be adj ustable, if desired.

I have described the above device with special reference toitsuse inconnectionwith seeding-machines, though it will be understood that thedevice may be used with equally good results in other forms of machinesand mechanisms, and I do not intend by anything contained herein to inanyway limit myself to a particular use for the said device, but expectto claim it for any use for which it may be found applicable.

It is obvious that the different parts of the described mechanism may bevaried from the particular construction set forth in the drawings anddescribed herein. I do not, therefore, intend to limit myself to theseexact constructions, but reserve the right to modify and change thespecial constructions of any or all the parts to best adapt the devicefor any use for which it may be found applicable.

Having thus described my invention, I claim 1. The combination, with adriving and driven shaft, and a belt or chain connecting said shafts, ofa wheel or pulley on one of said shafts having adjustable drivingprojections, said driving projections and said belt or chain being soformed as to prevent the slipping of one part with reference to theother, the formation of the parts being such that the belt or chain mayadjust itself to the said driving projections as said drivingprojections are adjusted, substantially as specified.

2. In a change of speed, a pulley having driving or sprocket projectionsadapted to be adjusted to or from the center of said wheel, a belt orchain passing over said driving projections, ratchet-teeth on saidchain, and similar teeth on the driving projections, whereby said chainis permitted to accommodate itself to the adjustment of said sprocketprojections, substantially as specified.

3. In a change of speed, a wheel or pulley having adjustable drivingprojections extending laterally therefrom and operating in radial slotstherein, an adj usting-disk in the same plane with said driving-Wheel,having spiral slots adapted to engage with each of the said drivingprojections, ratchet-teeth on said driving projections, and adriving-chain operating on said driving projections having similarratchet-teeth, substantially as specified.

4. The combination, with a driving and driven shaft and aconnecting-chain passing over a suitable sprocket-wheel on one of saidshafts, of an adjustable wheel or pulley having driving projectionsextending laterally therefrom and operating in radial slots therein, arevolving disk provided with spiral slots adapted to engage with each ofsaid spiral projections, ratchet-teeth on said chain and similar teethon said driving projections, and a tension device operating to take upor pay out the slack of said chain as said projections are adjusted,substantially as specified.

5. The combination, with a wheel or pulley having radial slots, ofdriving projections in said slots adapted to be adjusted to or from thecenter of said Wheel, said driving projections being formed with T-shaped heads, which, when turned to an unusual position, will passthrough said slots and will be held against displacement therein whenturned to their normal position, substantially as specified.

6. The combination, with a wheel or pulley having radial slots, of thedriving projections with T-shaped heads operating in said slots, and anadjusting-disk having spiral slots in the same plane With saiddriving-wheel and adapted to turn in relation thereto, each of saiddriving projections having an extended portion to fit into one of saidspiral slots, substantially as specified.

7. The combination, with a wheel or pulley having radial slots, ofdriving projections, each having a T-shaped head, and an extendedportion projecting laterally from said wheel, a disk in the same planewith said Wheel and adapted to turn in relation thereto, spiral slots insaid disk, one slot for each driving projection, each ofi said slotsbeing adapted to engage with the extended portion of one of said drivingprojections, and means for holding said disk in difierent positions ofadjustment with reference to said Wheel, substantially as specified.

In testimony whereof I have hereunto set my hand this 10th day of July,A. D. 1889.

CHARLES E. PATRIC.

Witnesses:

JOSHUA SCOTT, PAUL A. STALEY.

